In order to get 2-chloro-4,6-dinitroresocinol(CDNR) with high purity,which influences the synthesis of 4,6-diaminoresorcinol dihydrochloride,the solubility of CDNR in various solvents was measured by laser method and ...In order to get 2-chloro-4,6-dinitroresocinol(CDNR) with high purity,which influences the synthesis of 4,6-diaminoresorcinol dihydrochloride,the solubility of CDNR in various solvents was measured by laser method and ethanol was chosen as the solvent.The recrystallization process of CDNR was investigated and crystallizing parameters such as cooling rate,temperature and time were discussed.Experimental results show that the time and temperature of crystallization greatly affect the yield and a higher yield can be received at-8 ℃ for 5 h.Slow cooling rate is helpful to the crystallization of CDNR,and the mechanical stirring or ultrasonic treatment can increase the yield and the purity of CDNR.展开更多
An industrialized technique of preparation for oxidized com starch using oxygen as oxidant was investigated in this paper. The industrialized preparation parameters were optimized as follows： reaction temperature 85-...An industrialized technique of preparation for oxidized com starch using oxygen as oxidant was investigated in this paper. The industrialized preparation parameters were optimized as follows： reaction temperature 85-95 ℃, oxygen flow rate 8-12 L/min, reaction time 210 min, the ratio of starch to water 1：5, 3.5 wt% of NaOH and 0.1 wt% of catalyst. The experimental results show that the concentration of hydrolysate-oxidaton product is 16-18 wt%. The powdered products were gained through dehydrated and powdered process using quadruple-effect evaporator, spray drying tower and guide shell mixer. The composting test indicates that the degradability of the oxidized corn starch can reach 76.4%. The complexation capacity of calcium ions reaches 108.5 mg per gram oxidized starch, and the detergency ratio （P） reaches 1.30 as builder.展开更多
基金Sponsored by the Hi-Tech Research and Development Program of China(Grant No.2002AA305109)
文摘In order to get 2-chloro-4,6-dinitroresocinol(CDNR) with high purity,which influences the synthesis of 4,6-diaminoresorcinol dihydrochloride,the solubility of CDNR in various solvents was measured by laser method and ethanol was chosen as the solvent.The recrystallization process of CDNR was investigated and crystallizing parameters such as cooling rate,temperature and time were discussed.Experimental results show that the time and temperature of crystallization greatly affect the yield and a higher yield can be received at-8 ℃ for 5 h.Slow cooling rate is helpful to the crystallization of CDNR,and the mechanical stirring or ultrasonic treatment can increase the yield and the purity of CDNR.
文摘An industrialized technique of preparation for oxidized com starch using oxygen as oxidant was investigated in this paper. The industrialized preparation parameters were optimized as follows： reaction temperature 85-95 ℃, oxygen flow rate 8-12 L/min, reaction time 210 min, the ratio of starch to water 1：5, 3.5 wt% of NaOH and 0.1 wt% of catalyst. The experimental results show that the concentration of hydrolysate-oxidaton product is 16-18 wt%. The powdered products were gained through dehydrated and powdered process using quadruple-effect evaporator, spray drying tower and guide shell mixer. The composting test indicates that the degradability of the oxidized corn starch can reach 76.4%. The complexation capacity of calcium ions reaches 108.5 mg per gram oxidized starch, and the detergency ratio （P） reaches 1.30 as builder.
